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Hideyoshi Date (Katsunori Takahashi) is at his wits' end when we first meet him in. Deep in debt, with no job, no prospects, and no family, he's ready to end it all, and tries to do so, but he doesn't even have the nerve to commit suicide.
Wacky events are set in motion when Densuke (Roi Hayashi), a grade school boy, gets into Hideyoshi's cab and demands to be taken to his prep school. Hideyoshi at first tries to get rid of him, but when he learns that Densuke comes from a rich family, he seizes on the opportunity to get himself out of his financial hole. Recalling the advice of an old prison mate (Takashi Sasano), Hideyoshi hits upon the idea of demanding ransom from Densuke's parents.
Densuke is also on the run; he is impulsively running away from home because he hasn't been getting along with his parents lately. Complications ensue when Densuke's father turns out to be no ordinary business executive, but a yakuza boss (Sho Aikawa), who sends an army of underlings out to find Densuke ...